// license:BSD-3-Clause // copyright-holders:AJR /*************************************************************************** ASC-88 SCSI Adapter © 1985 Advanced Storage Concepts, Inc. This is a rather basic 8-bit SCSI host adapter on a quarter-size card. IRQ and DMA channels are software-selectable. There is a 2K HM6116P-2 SRAM on board, but not all of it seems to be addressable. The BIOS was designed to accommodate either a NMOS 5380 or a 53C80-40. ***************************************************************************/ #include "emu.h" #include "asc88.h" #include "bus/nscsi/devices.h" #include "machine/nscsi_bus.h" DEFINE_DEVICE_TYPE(ASC88, asc88_device, "asc88", "ASC-88 SCSI Adapter") asc88_device::asc88_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) : device_t(mconfig, ASC88, tag, owner, clock) , device_isa8_card_interface(mconfig, *this) , m_scsic(*this, "scsi:7:scsic") , m_eeprom(*this, "eeprom") , m_baseaddr(*this, "BASEADDR") , m_control(0) , m_irq(false) , m_drq(false) { } void asc88_device::device_start() { set_isa_device(); m_ram = make_unique_clear(0x800); save_item(NAME(m_control)); save_item(NAME(m_irq)); save_item(NAME(m_drq)); save_pointer(NAME(m_ram), 0x800); } void asc88_device::device_reset() { const offs_t baseaddr = 0xc0000 | (u32(m_baseaddr->read()) << 14); m_isa->install_rom(this, baseaddr, baseaddr | 0x37ff, "bios"); m_isa->install_bank(baseaddr | 0x3800, baseaddr | 0x3fef, m_ram.get()); m_isa->install_memory(baseaddr | 0x3ff0, baseaddr | 0x3ff7, read8sm_delegate(*m_scsic, FUNC(ncr5380n_device::read)), write8sm_delegate(*m_scsic, FUNC(ncr5380n_device::write))); m_isa->install_memory(baseaddr | 0x3ff8, baseaddr | 0x3ff8, read8smo_delegate(*this, FUNC(asc88_device::eeprom_r)), write8smo_delegate(*this, FUNC(asc88_device::control_w))); control_w(0); } WRITE_LINE_MEMBER(asc88_device::irq_w) { if (m_irq != state) { m_irq = state; if (BIT(m_control, 3)) m_isa->irq2_w(state); if (BIT(m_control, 4)) m_isa->irq3_w(state); if (BIT(m_control, 5)) m_isa->irq5_w(state); } } WRITE_LINE_MEMBER(asc88_device::drq_w) { if (m_drq != state) { m_drq = state; if (BIT(m_control, 6)) m_isa->drq1_w(state); if (BIT(m_control, 7)) m_isa->drq3_w(state); } } u8 asc88_device::dack_r(int line) { return m_scsic->dma_r(); } void asc88_device::dack_w(int line, u8 data) { m_scsic->dma_w(data); } void asc88_device::control_w(u8 data) { const u8 changing_bits = data ^ m_control; m_control = data; m_eeprom->di_write(BIT(data, 0)); m_eeprom->clk_write(BIT(data, 1)); m_eeprom->cs_write(BIT(data, 2)); if (m_irq) { if (BIT(changing_bits, 3)) m_isa->irq2_w(BIT(data, 3)); if (BIT(changing_bits, 4)) m_isa->irq3_w(BIT(data, 4)); if (BIT(changing_bits, 5)) m_isa->irq5_w(BIT(data, 5)); } if (m_drq) { if (BIT(changing_bits, 6)) m_isa->drq1_w(BIT(data, 6)); if (BIT(changing_bits, 7)) m_isa->drq3_w(BIT(data, 7)); } } u8 asc88_device::eeprom_r() { return m_eeprom->do_read(); } static INPUT_PORTS_START(asc88) PORT_START("BASEADDR") PORT_DIPNAME(0x7, 0x3, "BIOS Segment Address") PORT_DIPLOCATION("A16-A14:!1,!2,!3") // For each jumper, pins 1 & 2 closed = off (0); pins 2 & 3 closed = on (1) PORT_DIPSETTING(0x0, "C000h") PORT_DIPSETTING(0x1, "C400h") PORT_DIPSETTING(0x2, "C800h") PORT_DIPSETTING(0x3, "CC00h") PORT_DIPSETTING(0x4, "D000h") PORT_DIPSETTING(0x5, "D400h") PORT_DIPSETTING(0x6, "D800h") PORT_DIPSETTING(0x7, "DC00h") INPUT_PORTS_END ioport_constructor asc88_device::device_input_ports() const { return INPUT_PORTS_NAME(asc88); } void asc88_device::scsic_config(device_t *device) { downcast(*device).irq_handler().set("^^", FUNC(asc88_device::irq_w)); downcast(*device).drq_handler().set("^^", FUNC(asc88_device::drq_w)); } void asc88_device::device_add_mconfig(machine_config &config) { NSCSI_BUS(config, "scsi"); NSCSI_CONNECTOR(config, "scsi:0", default_scsi_devices, nullptr); NSCSI_CONNECTOR(config, "scsi:1", default_scsi_devices, nullptr); NSCSI_CONNECTOR(config, "scsi:2", default_scsi_devices, nullptr); NSCSI_CONNECTOR(config, "scsi:3", default_scsi_devices, nullptr); NSCSI_CONNECTOR(config, "scsi:4", default_scsi_devices, nullptr); NSCSI_CONNECTOR(config, "scsi:5", default_scsi_devices, nullptr); NSCSI_CONNECTOR(config, "scsi:6", default_scsi_devices, nullptr); NSCSI_CONNECTOR(config, "scsi:7", default_scsi_devices, "scsic", true) .option_add_internal("scsic", NCR5380N) .machine_config([this] (device_t *device) { scsic_config(device); }); EEPROM_93C06_16BIT(config, m_eeprom); // NMC9306N } ROM_START(asc88) ROM_REGION(0x3800, "bios", ROMREGION_ERASE00) ROM_LOAD("asc88_rev._4.0n_14-nov-91.u14", 0x0000, 0x2000, CRC(8657d1bf) SHA1(49c44aafbb3f28478e4b5eeaa208b147fdf253b9)) // TMS27C64-IJL ROM_END const tiny_rom_entry *asc88_device::device_rom_region() const { return ROM_NAME(asc88); }